Knocking/shudder though steering wheel when turning ignition off.

Morning all.I hope I'm posting in the right place for starters as I've exhausted so many answers on here in reference to my MGF problem by trawling through the various related threads.Every time I turn off my ignition I get a knocking sound,a clunk.If I hold my hand on the steering wheel palm down I can feel and I can feel it lower down the column.I've checked the subframe bolts and everything I can think of but I can't trace it.I must stress it's only when shutting it off and not when driving at all.It's a 1997 MGF VVC.Many thanks in advance everyone,the majority off every problem I've ever had has been solved thriugh this forum.

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